CN113493879A

CN113493879A - Iron-nickel cobalt-substituted hard alloy ultrathin circular blade

Info

Publication number: CN113493879A
Application number: CN202110685907.6A
Authority: CN
Inventors: 陈文�; 郭丽波; 李国平
Original assignee: Laiwu Vocational and Technical College
Current assignee: Laiwu Vocational and Technical College
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2021-10-12

Abstract

The invention discloses an iron-nickel cobalt-substituted hard alloy ultrathin circular knife for a paper cutter, which consists of 65-95% of WC and 5-35% of a metal binder phase, wherein the metal binder phase consists of 70-90% of Fe, 10-20% of Ni and 5-15% of Co in mass fraction. The invention adopts most iron-nickel metal to replace part of expensive metal cobalt, and obtains compact ultrathin round cutter blank with higher bending strength under vacuum and proper preparation, pressing and sintering, thereby meeting the aim of reducing the production cost in industries such as paper cutters and the like.

Description

Iron-nickel cobalt-substituted hard alloy ultrathin circular blade

Technical Field

The invention relates to the technical field of alloy products, in particular to a hard alloy ultrathin circular blade for a paper cutter.

Background

The excellent use performance of the hard alloy product enables the hard alloy product to be widely applied. However, the production process of the hard alloy is relatively complex, the technical content is high, and the production cost is high. Cobalt is the most important binder in cemented carbide, but cobalt is rare and expensive, and due to the shortage of cobalt resources, unstable sources, high price and the like in China, the problem of searching and researching materials for replacing cobalt in cemented carbide is generally concerned by cemented carbide workers.

Hard alloy round blades of various slitting machines and splitting machines belong to thin parts, and are easy to deform in the sintering process, so that the requirements on various production procedures are particularly high, and the product quality is completely guaranteed by methods of equipment, production processes and the like. People invest a lot of manpower and material resources for research and improvement on equipment and production technology, and obtain a lot of surprising achievements. However, the cemented carbide material is mainly tungsten-cobalt cemented carbide. Fe. Ni is also commonly present in cemented carbide materials as a binder phase, but still does not completely replace cobalt. Fe. Co and Ni are elements in the same group, and are very similar to a phase diagram formed by WC, the wettability of the alloy on WC is the same as that of cobalt and nickel in vacuum, the wetting angle is equal to zero, and iron is poor, so that the alloy strength can be improved by improving the wettability of the iron. A certain amount of Ni is added into Fe, so that the wettability of bonding relative to WC can be improved, and meanwhile, Fe and Ni form an infinite solid solution, so that Fe is strengthened. Practice shows that the ratio of Fe: ni = 3: the iron-nickel binder phase of 1 has the best alloying properties. The addition of Co powder in certain amount to alloy the binding phase and raise the connection strength with WC shows that the cobalt phase has relatively great strengthening effect compared with nickel phase, and Co, Fe and Ni may form infinite solid solution to further improve and strengthen the wetting of the binding phase. According to the theory and the research result, aiming at the common failure mode of the circular blade, Fe-Ni-Co is used as a main binding phase to improve the alloy structure, strengthen the alloy performance and develop a high-strength iron-nickel cobalt-substituted strength material.

Therefore, the problems that the cost of raw materials of the hard alloy ultrathin round blade of the paper cutter is high, the sintered blank is easy to deform, and the quality of a machined product is not easy to control exist in the prior art.

Disclosure of Invention

The invention aims to provide an iron-nickel cobalt-substituted hard alloy ultrathin circular blade to solve the technical problem.

In order to achieve the purpose, the invention adopts the following technical scheme:

the iron-nickel cobalt-substituted hard alloy ultrathin circular knife for the paper cutter is prepared from the following raw materials in parts by mass: 65-95% of WC and 5-35% of bonding metal, wherein the bonding metal consists of 70-90% of Fe, 10-20% of Ni and 78-15% of Co5 in mass fraction.

As a further scheme of the invention, the health-care food is prepared from the following raw materials in parts by weight: 80% of WC and 20% of bonding metal.

As a further aspect of the invention, the binder metal consists of 75% by mass of Fe, 20% by mass of Ni and 5% by mass of Co.

The invention has the beneficial effects that: the invention adopts most iron-nickel metal to replace part of expensive metal cobalt, and obtains compact ultrathin round cutter blank with higher bending strength under vacuum and proper preparation, pressing and sintering, thereby meeting the aim of reducing the production cost in industries such as paper cutters and the like. Most of iron-nickel metal is adopted to replace part of expensive metal cobalt, and a compact ultrathin round cutter blank with high bending strength is obtained under vacuum and appropriate preparation, pressing and sintering, so that the aim of reducing the production cost in industries such as a paper cutter is fulfilled. After sintering, a one-step annealing process is added, so that residual stress in a hard alloy blank product is eliminated, and the processing toughness of the alloy is enhanced. The processing procedure has increased the coarse grinding process in plane, and the plane precision and the locating hole machining precision of circular knife piece are more accurate, have designed special fixture, make every piece internal hole location more accurate, have guaranteed that the cutting atress of grinding the blank is even, have promoted the depth of parallelism and the concentricity of grinding the product.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An iron-nickel cobalt-substituted hard alloy ultrathin circular knife for a paper cutter comprises 65-95% of WC and 5-35% of a metal binding phase, wherein the metal binding phase comprises 70-90% of Fe, 10-20% of Ni and 5-15% of Co in mass percentage.

The first embodiment is as follows: the formula of the iron-nickel cobalt-substituted hard alloy ultrathin circular knife for the paper cutter is prepared from the following raw materials in parts by weight: 80% of WC and 20% of bonding metal. Wherein the bonding metal consists of 75 mass percent of Fe, 20 mass percent of Ni and 5 mass percent of Co.

Example two: the formula of the iron-nickel cobalt-substituted hard alloy ultrathin circular knife for the paper cutter is prepared from the following raw materials in parts by weight: 85% of WC and 15% of bonding metal. Wherein the bonding metal consists of 70 mass percent of Fe, 20 mass percent of Ni and 10 mass percent of Co.

The production process of the hard alloy ultrathin round blade comprises the following steps:

step one, preparing a hard alloy circular blade blank material, which comprises the following steps:

1) proportioning, namely preparing various powder materials of the hard alloy ultrathin circular blade raw material, including tungsten carbide, iron, cobalt and nickel, according to a formula;

2) mixing by a ball mill, and adding alcohol, a paraffin forming agent and the powder prepared in the step one into a mixing device of the ball mill according to the weight ratio; starting the ball mill, and grinding and uniformly mixing the materials into slurry under the action of a ball bat in the ball mill;

3) drying, namely transferring the slurry into a drying device for drying, wherein the dried slurry is irregular particles, and the drying device is externally connected with an alcohol recovery device for recovering alcohol for recycling;

4) wiping and screening, namely wiping and screening the dried granular materials to form powder;

5) pressing and molding, namely performing compression molding on the powdery material according to the weight and specification requirements of the product;

6) stacking and loading: placing the product of the molded punched round material into a treated graphite boat, and then layering and stacking the product into a graphite disc boat frame;

7) vacuum sintering, namely transferring the stacked materials into a vacuum sintering furnace for sintering;

8) shaping: shaping the sintered blank to ensure that the flatness meets the post-processing requirement;

9) annealing: the shaped blanks are stacked in a vacuum furnace for annealing;

10) and (6) checking the dimensional accuracy of the blank.

11) And grinding, namely transferring the annealed ultrathin circular blade blank with qualified dimensional precision into a grinding device for grinding to obtain a semi-finished product.

Step two, the hard alloy round blade is formed by finish machining, and the method comprises the following steps: roughly grinding the plane of the blade; finely grinding the blade plane; finely grinding the inner circle of the circular knife and the positioning groove; the excircle and the rough edge of the sharpening sheet are sharpened; finely edging; inspecting the appearance and the dimensional accuracy; testing a blade; marking; inspecting the cutting edge by a 100% microscope; and (6) packaging qualified products.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an ultra-thin circular knife of cobalt carbide is substituted to iron-nickel for paper cutter which characterized in that is prepared by the raw materials of mass fraction: 65-95% of WC and 5-35% of bonding metal, wherein the bonding metal consists of 70-90% of Fe, 10-20% of Ni and 78-15% of Co5 in mass fraction.

2. The ultra-thin round iron-nickel cobalt-substituted hard alloy cutter for the paper cutter as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 80% of WC and 20% of bonding metal.

3. The ultra-thin circular iron-nickel cobalt-substituted cemented carbide blade for a paper cutter as claimed in claim 1, wherein the binder metal consists of 75% by mass of Fe, 20% by mass of Ni and 5% by mass of Co.